Dynamics of nitrogen concentration on intercropped ryegrass
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Universidade Estadual de Maringá
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The dynamics of nitrogen (N) in ryegrass inte rcropped with different forage species with regard to dry matter (DM) accumulation within an agroecol ogical transition system was evaluated. Annual ryegrass was intercropped with black oats (RY + BO), white clov er (RY + WC) and forage peanut (RY + FP). The experimental design was completely random ized, with three replications. The study applied the N dilution model for plant tissue which comparatively uses modifiable factors of the environment at optimal levels. The model shows decline in N concen tration due to the DM accumulation of temperate grass pastures. Data were compared to model by th e root mean square deviation analysis. Dilution coefficient ( β ), used in all pasture samples, was lower than -0.60. Highest N concentration decline in plant tissues, due to DM accumulation, occurred in RY + WC pastures ( β = -0.94), followed by RY + FP ( β = - 0.86) and RY + BO ( β = - 0.67), respectively. Ryegrass interc ropped with white clover showed the highest N content in plant tissue, with a nitrogen nutrition index close to the proposed model.
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Agrociencias